package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticsearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {

        //1.动态构建出查询需要的dsl语句

        //准备检索请求
        SearchRequest searchRequest =   buildSearchRequest(param);

        SearchResult searchResult = null;

        try {
            //执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticsearchConfig.COMMON_OPTIONS);

            //分析响应数据，封装成我们需要的格式

             searchResult = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }



        return searchResult;
    }

    //构建结果数据
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {

        SearchResult result = new SearchResult();

        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits()!=null&&hits.getHits().length>0){

            for (SearchHit hit : hits.getHits()) {

                String sourceAsString = hit.getSourceAsString();
                SkuEsModel sku = new SkuEsModel();

                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);

                if(StringUtils.isNotEmpty(param.getKeyword())){

                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();

                    skuEsModel.setSkuTitle(string);
                }

                esModels.add(skuEsModel);

            }
        }
        result.setProducts(esModels);


        //2.当前所有商品涉及到的属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();

        ParsedNested attr_agg = response.getAggregations().get("attr_agg");

        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");

        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {

            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            //1.得到属性Id
            long attrId = (long) bucket.getKeyAsNumber();

            //2.得到属性名字
            ParsedStringTerms attr_name_agg = (ParsedStringTerms) bucket.getAggregations().get("attr_name_agg");
            String attrName = attr_name_agg.getBuckets().get(0).getKeyAsString();

            //3.得到属性的所有值
            ParsedStringTerms attr_value_agg = (ParsedStringTerms) bucket.getAggregations().get("attr_value_agg");
            List<String> attrValues = attr_value_agg.getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;

            }).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }


        result.setAttrs(attrVos);

        //3.当前所有商品涉及到的品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();

        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");

        for (Terms.Bucket bucket : brand_agg.getBuckets()) {

            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            long brandId = (long) bucket.getKeyAsNumber().longValue();

            brandVo.setBrandId(brandId);

            ParsedStringTerms brand_img_agg = bucket.getAggregations().get("brand_img_agg");

            String brandImg = brand_img_agg.getBuckets().get(0).getKeyAsString();

            brandVo.setBrandImg(brandImg);

            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandName(brandName);

            brandVos.add(brandVo);

        }


        result.setBrands(brandVos);
        //4.当前所有商品涉及到的分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();

        for (Terms.Bucket bucket : buckets) {

            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            String keyAsString = bucket.getKeyAsString();

            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");

            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);


            catalogVos.add(catalogVo);
        }

        result.setCatalogs(catalogVos);
        /*
        以上可以从聚合信息中获取
         */

        //5.分页信息-页码
        result.setPageNum(param.getPageNum());
        //6.总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //7.总页码(计算得到)
        int totalPages = (int) (total%EsConstant.PRODUCT_PAGESIZE==0?total%EsConstant.PRODUCT_PAGESIZE:(total%EsConstant.PRODUCT_PAGESIZE+1));
        result.setTotalPages(totalPages);

        List<Integer> pageNavs =  new ArrayList<>();
        for (int i = 0; i <=totalPages; i++) {

            pageNavs.add(i);
        }

        result.setPageNavs(pageNavs);

        //构建导航功能
        if(param.getAttrs()!=null && param.getAttrs().size()>0){


            List<SearchResult.NavVo>  navVos= new ArrayList<>();

            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {

                //分析每个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);

                R r = productFeignService.attrInfo(Long.parseLong(s[0]));

                if(r.getCode()==0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });

                    navVo.setNavName(data.getAttrName());
                }else {

                    navVo.setNavName(s[0]);
                }

                //取消了面包屑以后，我们要跳转到哪个地方。将请求地址的url里的当前条件置空
                //拿到所有查询条件，去掉当前
                String encode = null;

                try {
                   encode = URLEncoder.encode(attr, "UTF-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                String replace = param.get_queryString().replace("&attrs=" + encode, "");
                navVo.setLink("http://search.gulimall.com/list.html"+replace);


                return navVo;
            }).collect(Collectors.toList());
        }

        return result;
    }

    //准备检索请求
    private SearchRequest buildSearchRequest(SearchParam param) {

        System.out.println("param"+param);

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         * 查询，模糊匹配、过滤（按照属性、分类、品牌、价格区间、库存）
         */
        //1.构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2 filter
        if(param.getCatalog3Id()!=null){

            //按照三级分类Id查询

            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }

        //按照品牌Id进行查询
        if(param.getBrandId()!=null&&param.getBrandId().size()>0){

            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //按照属性查询
        if(param.getAttrs()!=null&&param.getAttrs().size()>0){


            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();

                String[] s = attrStr.split("_");
                String attrId = s[0]; //检索的属性Id

                String[] attrValues = s[1].split(":"); //这个属性值检索用的值




                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));


                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }


        }

        //按照是否有库存进行查询
        if(param.getHasStock()!=null){

            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }

        //按照价格区间进行检索
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");

            if(s.length==2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length==1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }


        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页
         *
         */

        //2。1 排序
        if(!StringUtils.isEmpty(param.getSort())){

            String sort = param.getSort();
            String[] s = sort.split("_");


            SortOrder order = s[1].equalsIgnoreCase("asc")? SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);

        }

        //2.2 分页


        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);



        //2.3 高亮
        if(!StringUtils.isEmpty(param.getKeyword())){

            HighlightBuilder builder = new HighlightBuilder();

            builder.field("skuTitle");

            builder.preTags("<b style='color:red'>");

            builder.postTags("</b>");

            sourceBuilder.highlighter(builder);
        }

        //2.4聚合分析
        //品牌聚合

        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");

        brand_agg.field("brandId").size(50);


        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));

        sourceBuilder.aggregation(brand_agg);

        //分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);


         catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));

         sourceBuilder.aggregation(catalog_agg);

         //属性聚合attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        //聚合当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(10);
        //聚合当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);


        String s = sourceBuilder.toString();

        System.out.println("构建的DSL语句："+s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }
}
